Students were asked to determine how many grams of hydrofluoric acid (HF) are required to react completely with 23.68 grams of calcium hydroxide in the following reaction? _1_ Ca(OH)2 + __2_ HF à __1_ CaF2 + __2_H2O

Based on the stoichiometry of this problem, the theoretical yield for this problem is 12.79 g HF. But, when the students actually conducted the experiment, their actual yield was 10.41 g HF collected.

What is the percent yield of HF?

tracks, burrows, eggshells, nests, tooth marks, or gastroliths

percent abundance for cu-63 can be shown as:

63 x + 65 (1-x) = 62.9296

65 - 62.9296 = 2 x

x = 1.035

thus, percent abundance for cu-63 is 1.035

percent abundance for cu-65 can be shown as:

63 x + 65 (1-x) = 64.9278

65 - 64.9278 = 2 x

x = 0.0361

thus, percent abundance for cu-63 is 0.0361

the mass spectrum of cu-63 showing the intense peak as, this isotope is found in nature more abundantly around 92.38 % in comparison to cu-65 which is found 62.58 % naturally